JP3564348B2 - Feeder for sheet-fed printing press - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
According to the present invention, the printing paper transported on the paper feed plate is transported to the front contact plate side along the surface of the paper feed plate by air blown from an air jet port provided on the paper feed plate. And a sheet feeding device of a sheet-fed printing press configured to perform the above-described operations.
[0002]
[Prior art]
FIG. 4 is a side view of a sheet feeder of a general sheet-fed printing press. FIG. 5 is an X view of FIG. 4, and FIG.
In FIG. 1, printing papers 1 stacked in a paper feeding pile 01 are transferred onto a feeder board 3 one by one from upper sheets by a separator 2. The paper 1 on the feeder board 3 is conveyed by the paper feed tape 4 while overlapping as shown in FIG.
Here, the sheet 1 is positioned in the traveling direction, and is then held by the swing gripper 6 and waits until it is transferred to the intermediate cylinder 7. Further, the paper 1 hits the front abutment plate 5 and is moved and adjusted in the horizontal direction by the horizontal needle 8 during standby, and the paper 1 hits the horizontal abutment plate 9 to be positioned in the horizontal direction.
[0003]
A paper feed plate 10 is provided between the downstream end of the paper feed tape 4 and the front contact plate 5, and the paper 1 moves along the upper surface of the paper feed plate 10 and hits the front contact plate 5. Ideally, the leading end of the paper 1 hitting the front contact plate 5 is in close contact with the surface (upper surface) of the paper feed plate 10 and stands by until the gripper 6 grips the surface. desirable. However, the paper 1 has a deformation such as curl, so that a part of the paper 1 is lifted from the paper feed plate 10 and wins. When the leading edge of the sheet 1 is held by the swing gripper 6 in a state of being lifted in this way, the relative position of the leading edge of the sheet 1 with respect to the swing gripper 6 is not constant, and a sheet feeding error occurs.
[0004]
As a means for preventing the occurrence of such a problem, there is a technique disclosed in Japanese Patent Application Laid-Open No. 56-149937 as shown in FIGS. 5 is a view taken in the direction of the arrow X in FIG. 4, and FIG. 6 is a longitudinal sectional view showing details in the vicinity of the front contact portion.
In the related art, as shown in FIGS. 5 and 6, an air outlet 11 for blowing air toward the inside of the paper 1 is provided in a paper feed plate 10, and the air is ejected from the air outlet 11. A high-speed air layer 011 is formed between the upper surface of the paper feed plate 10 and the sheet 1 by air, and the negative pressure of the air layer 011 moves the sheet 1 along the upper surface of the paper feed plate 10 so that the front plate 5 It is configured to send to
[0005]
[Problems to be solved by the invention]
However, the technology disclosed in Japanese Patent Application Laid-Open No. 56-149937 has the following problems.
That is, in the related art, the paper 1 is sent to the front contact plate 5 along the upper surface of the paper feed plate 10 by the negative pressure of the air layer 011. However, since the sheet 1 rises by the thickness of the air layer 011 and the thickness of the air layer 011 is unstable, the relative positional error between the swing gripper 6 and the leading end of the sheet 1 is increased. , And the factor of the sheet feeding error still remains.
[0006]
In the prior art, as shown in FIG. 4, the timing of blowing air from the air outlet 11 is controlled by a switching valve 13 provided between the air source 12 and the air outlet 11. are doing. The opening / closing timing of the switching valve 13 is, for example, normally, when the paper 1 is horizontally aligned with the horizontal needle 8, the ejection of air is turned off to facilitate movement of the paper 1.
However, in the case of the curled sheet 1, if the ejection of air is turned off and the sheet 1 is leveled by the horizontal needle 8, the curl returns naturally on the sheet feed plate 10, causing a sheet feeding error. . In particular, in a high-speed machine, a time difference can be taken between the horizontal needle 8 and the grip by the swing gripper 6 only for a very short time. Therefore, it is not possible to control the curl by turning on the air flow during this time difference. Have difficulty.
[0007]
The present invention has been made in view of the above-mentioned problems of the prior art, and when paper is transported over a paper feed plate, the paper can always be transported in close contact with the paper feed plate, thereby improving paper feeding accuracy and improving paper type. It is another object of the present invention to provide a sheet feeding device for a sheet-fed printing press in which operating conditions suitable for printing purposes can be selected.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention is directed to a printer according to the first aspect, wherein printing paper transported from a feeder board along the upper surface of a paper feed plate is blown out from an air outlet provided in the paper feed plate. In the sheet-fed printing press configured to transfer the air to the front contact side along the upper surface of the paper feed plate by air, the paper feed plate is configured to transfer the air to the downstream side on the upstream surface of the downstream portion. A sheet feeding device for a sheet-fed printing press is provided, wherein a suction groove for guiding is provided, and the air ejection port is opened at an upstream portion of the suction groove.
[0009]
According to this invention, a fluidized bed of air is formed in the suction groove depressed to a certain depth from the upper surface of the paper feed plate, and a negative pressure due to the flow of air is reliably formed in the suction groove. As in the technique, an air layer does not intervene between the paper and the upper surface of the paper feed plate, and the paper does not float on the air layer, and the paper is securely adhered to the upper surface of the paper feed plate. As a result, there is no lifting of the paper and the gripping accuracy is improved.
[0010]
According to the second aspect of the present invention, the printing paper transported along the upper surface of the paper feed plate from the feeder board is formed on the upper surface of the paper feed plate by air blown out from an air outlet provided in the paper feed plate. In a sheet-fed printing press configured to be transported along the front plate side, an air mode adjusting unit that changes an ejection mode of air ejected from the air ejection port is provided. It is in the paper feeder of the leaf-type printing press.
According to this invention, by switching the flow path switching valve constituting the air mode adjusting means, a mode for turning on / off air blowing for each paper feeding cycle and a mode for continuously blowing air are provided. Since the switching can be performed, the printing press can be operated under appropriate suction conditions according to the type of paper and the degree of curl deformation.
[0011]
According to a third aspect of the present invention, in the first aspect, the air ejection port is opened in the suction groove so as to eject air substantially parallel to an upper surface of the paper feed plate.
[0012]
According to a fourth aspect of the present invention, in the first aspect, the suction groove is formed such that a bottom surface thereof is parallel to an upper surface of the paper feed plate.
[0013]
According to the third and fourth aspects of the present invention, the air outlet portion of the air outlet port blows the air along the parallel bottom surface of the suction groove and in parallel with the upper surface of the paper feed plate, and therefore, with respect to the paper. However, since the air is blown out in parallel, the air force component that pushes up the paper is reduced, and the paper is more firmly adhered to the upper surface of the paper feed plate, and further stable paper feeding is achieved. Becomes possible.
[0014]
According to a fifth aspect of the present invention, in the first aspect, the suction groove is inclined such that the depth of the bottom surface of the suction groove on the downstream side of the paper feed plate is greater than the depth of the opening portion of the air outlet. It is characterized by being formed on a surface.
According to this invention, the upward component of the airflow blown out from the air ejection port can be further reduced by making the bottom surface of the suction groove an inclined surface inclined downward along the airflow, More stable and strong paper suction force can be obtained.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail using embodiments shown in the drawings. However, unless otherwise specified, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but are merely illustrative examples. Only.
[0016]
1A and 1B show a first embodiment of a sheet feeding device for a sheet-fed printing press according to an embodiment of the present invention, wherein FIG. 1A is a side view of the vicinity of a front contact portion and an air supply system, and FIG. FIG. FIG. 2 is a cross-sectional view of the paper feed plate in the second embodiment, and FIG. 3 is a cross-sectional view of the paper feed plate in the third embodiment.
[0017]
In the first embodiment shown in FIG. 1, reference numeral 10 denotes a paper feed plate, 1 denotes printing paper, 5 denotes a front contact plate, 11 denotes an air jet hole perforated in the paper feed plate 10, and 23 denotes the air jet port 11. Is an air inlet that communicates with
Reference numeral 20 denotes a suction groove, which is formed on the upper surface of the paper feed plate 10 so that its bottom surface 20 is substantially parallel to the upper surface of the paper feed plate 10, and the air ejection port 11 is provided upstream thereof. It is opened obliquely, extends downstream from the opening, and is open to the front abutment plate 5 side.
12 is an air source, and 24 is an air pipe connecting the air source 12 and the air inlet 23 of the paper feed plate 10. A flow path switching valve 21 is provided in the middle of the air pipe 24, and the main flow path 022 passing through the switching valve 13 and the bypass flow path 22 not passing through the switching valve 13 are selected by the flow path switching valve 21. It can be switched automatically.
[0018]
In the sheet feeding device of the sheet-fed printing press having such a configuration, as shown in FIG. 4, the printing paper 1 is transferred onto the feeder board 3 one by one, and the printing paper 1 is overlapped on the feeder board 3 as shown in FIG. The sheet is conveyed by the feed tape 4 and reaches the front contact plate 5. Here, the paper 1 is positioned in the traveling direction, and is then held by the swing gripper 6 and waits until it is delivered to the intermediate cylinder 7. Further, the paper 1 hits the front abutment plate 5 and is moved and adjusted in the horizontal direction by the horizontal needle 8 during standby, and hits the horizontal abutment plate 9 to perform positioning in the horizontal direction.
[0019]
Here, the paper 1 moves along the upper surface of the paper feed plate 10 provided between the downstream end of the paper feed tape 4 and the front contact plate 5 and hits the front contact plate 5.
On the other hand, the air from the air source 12 passes through the air pipe 24 through either the main flow path 022 passing through the switching valve 13 or the bypass flow path 22 not passing through the switching valve 13 as described later. Then, the air is introduced from the air inlet 23 into the air outlet 11, and is blown out from the air outlet 11 into the suction groove 20.
The air blown out from the air jet port 11 flows in the suction groove 20 in the downstream direction, and the flow of the air causes the inside of the suction groove 20 to have a negative pressure. The paper 1 moving along the upper surface of the paper 10 is attracted to the upper surface of the paper feed plate 10.
[0020]
Further, at the time of supplying the air, by operating the flow path switching valve 21 to flow air into the main flow path 022 passing through the switching valve 13, the switching valve 13 is opened and closed at a predetermined cycle, Mode control can be performed to turn on / off the blowing of air from the air outlet 11 for each paper feeding cycle. On the other hand, when air is caused to flow through the bypass flow path 22 that does not pass through the switching valve 13 by the flow path switching valve 21, the blowing of air from the air ejection port 11 is continuously performed regardless of the paper feeding cycle. I can do it.
[0021]
Therefore, according to this embodiment, a fluidized bed of air is formed in the suction groove 20 depressed to a certain depth from the upper surface of the paper feed plate 10, and as described above, the air flows into the suction groove 20 due to the flow of air. Since a negative pressure is reliably formed, an air layer does not intervene between the sheet 1 and the upper surface of the paper feed plate 10 as in the related art, and the sheet 1 does not float on the air layer. The paper feed plate 1 is securely brought into close contact with the upper surface. Thereby, the paper 1 is not lifted and the gripping accuracy is improved.
Further, by switching the flow path switching valve 21, a mode in which air is blown ON / OFF and a mode in which air is continuously blown can be switched for each paper feeding cycle. The printing press can be operated under appropriate suction conditions according to the degree of curl and the like.
[0022]
In the second embodiment shown in FIG. 2, the ejection port 30a of the air ejection port 30 to the suction groove 20 is oriented substantially parallel to the upper surface of the paper feed plate 10 or substantially parallel to the bottom surface 20a of the suction groove 20. ing. That is, in the first embodiment shown in FIG. 1, air is blown obliquely upward to the upper surface of the paper feed plate 10, whereas in this embodiment, the air outlet 30a of the air outlet 30 is The air is blown out in parallel to the upper surface of the paper feed plate 10.
[0023]
In the first embodiment, since the air is blown obliquely upward from the air outlet 11, the upward component of the flow of the blown air tends to float the paper 1 upward near the outlet to the suction groove 20, Although partially, a part of the sheet 1 may have an unstable shape.
According to the second embodiment, however, the ejection port 30a of the air ejection port 30 is configured to blow air in parallel to the upper surface of the paper feed plate 10, and thus to blow paper in parallel. Therefore, the component of the aerodynamic force that pushes the paper upward is reduced, and the paper 1 is more securely brought into close contact with the upper surface of the paper feed plate 1, so that more stable paper feeding is possible.
Other configurations are the same as those of the first embodiment, and the same members are denoted by the same reference numerals.
[0024]
In the third embodiment shown in FIG. 3, the suction groove 20 is formed so that its depth gradually becomes deeper as it goes downstream in the air flow direction. That is, in this embodiment, the bottom surface 40a of the suction groove 20 is formed as an inclined surface such that the depth on the downstream side of the paper feed plate 10 is greater than the depth on the opening side of the air ejection port 30. Have been.
[0025]
The air flow blown out from the slit-shaped air ejection ports 11 and 30 has a hydrodynamic property that tends to flow along the bottom surface 40a of the suction groove 20. Therefore, as in the third embodiment, by forming the bottom surface 40a of the suction groove 20 as an inclined surface inclined downward along the air flow, the upward component of the air flow blown out from the air ejection port 30 is further reduced. Can be reduced, and a more stable and strong suction force can be obtained.
Other configurations are the same as those of the second embodiment, and the same members are denoted by the same reference numerals.
[0026]
【The invention's effect】
As described above, according to the present invention, a fluidized bed of air is formed in the suction groove depressed to a certain depth from the upper surface of the paper feed plate, and a negative pressure due to the flow of air is reliably formed in the suction groove. Therefore, unlike the related art, an air layer does not intervene between the sheet and the upper surface of the paper feed plate, and the paper does not float on the air layer, and the paper surely adheres to the upper surface of the paper feed plate. As a result, there is no lifting of the sheet, the grip accuracy is improved, and the paper feeding accuracy can be improved.
[0027]
In particular, according to the second aspect of the present invention, a mode in which air is blown on / off in each paper feeding cycle by switching the flow path switching valve constituting the air mode adjusting means, and a mode in which air is continuously supplied. Can be switched, so that the printing press can be operated by selecting appropriate suction conditions according to the type of paper and the degree of curl deformation.
[Brief description of the drawings]
1A and 1B show a first embodiment of a sheet feeding device of a sheet-fed printing press according to an embodiment of the present invention, wherein FIG. 1A is a side view of the vicinity of a front contact portion and an air supply system, and FIG. It is an arrow A view in A).
FIG. 2 is a sectional view of a paper feed plate according to a second embodiment.
FIG. 3 is a sectional view of a paper feed plate in a third embodiment.
FIG. 4 is a side view of a sheet feeding device of a general sheet-fed printing press.
FIG. 5 is a view as viewed from an arrow X in FIG. 4 in the prior art.
FIG. 6 is a detailed view of a forehead in the related art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Printing paper 2 Separator 3 Feeder board 4 Paper feed tape 5 Front contact plate 6 Swing gripper 7 Intermediate cylinder 8 Horizontal needle 9 Horizontal contact plate 10 Paper feed plate 11, 30 Air ejection port 12 Air source 13 Switching valve 20, 40 Suction groove 20a, 40a Bottom surface 21 Flow path switching valve 22 Bypass flow path 24 Air tube 022 Main flow path 30a Jet port

Claims (5)

The printing paper transported along the upper surface of the paper feed plate from the feeder board is moved along the upper surface of the paper feed plate by the air blown out from the air ejection port provided on the paper feed plate to the front contact plate side. In the sheet-fed printing press configured to transport, the paper feed plate is provided with a suction groove for guiding the air to the downstream side on the upper surface of the downstream portion, and the air is provided at an upstream portion of the suction groove. A sheet feeding device for a sheet-fed printing press, characterized in that an ejection port is opened. The printing paper transported along the upper surface of the paper feed plate from the feeder board is moved along the upper surface of the paper feed plate by the air blown out from the air ejection port provided on the paper feed plate to the front contact plate side. A sheet feeding apparatus for a sheet-fed printing press, comprising: a sheet-fed printing press configured to transfer an air mode adjusting means for changing a jetting mode of air jetted from the air jet port. . 2. A sheet feeding device for a sheet-fed printing press according to claim 1, wherein said air outlet is opened in said suction groove so as to blow air substantially parallel to an upper surface of said paper feed plate. 2. The sheet feeding device for a sheet-fed printing press according to claim 1, wherein the suction groove is formed such that a bottom surface thereof is parallel to an upper surface of the paper feed plate. The suction groove is characterized in that the bottom surface is formed on an inclined surface such that the depth on the downstream side of the paper feed plate is greater than the depth on the opening side of the air jet port. A sheet feeding device for a sheet-fed printing press according to claim 1.

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